GB1438882A - Gear testing apparatus - Google Patents

Abstract

1438882 Testing gear dimensions electrically MAAG GEAR-WHEEL & MACHINE CO Ltd 16 Sept 1974 [15 March 1974] 40234/74 Heading G1N A toothed gear 2, Fig. 1 to be tested for pitch errors, is mounted for rotation on a mandrel 3 opposite a slide 11, adjustable vertically at 6a and horizontally at 13, and which carries two rails 14a, 14b, Fig. 2 whose angular relationship is fixed by bolts 15a, 15b, each rail mounting a block 16a, 16b carrying a feeler head 12a, 12b in a holder 18a, 18b incorporating an inductive displacement transducer connected to measuring units in housing 22. The output voltage characteristics from the transducers are AD and BC respectively Fig. 8. The slide H is provided with a forward limit stop 11a. When the feelers 12 are located on the pitch circle as at G and H, Fig. 9 and a rear limit stop 11b, when the feelers are located outside the gear teeth as at S and L. The feelers 12a, 12b are initially located manually opposite a tooth gap at S, with the test gear 2 rotating, and a key 26 is operated, whereupon the process computer 40 controls the feeler feed mechanism in synchronism with the gear 2 to cause the feelers to travel from S to G, G to H, H to K and K to L, each distance being measured by a counter fed with clockpulses. The point H is made to coincide with the crossover point F of the output voltages AD, BC of the inductive transducers. The above cycle is repeated round the gear 2 and the results analyzed in a computer at 30, to determine the pitch errors, which are fed out at 51, 52, 53.